Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1996-02-02
1998-08-18
Dougherty, Thomas M.
Electrical generator or motor structure
Dynamoelectric
Rotary
310103, 310268, 310266, 310114, 310156, 360 9903, 360 9907, 360 9912, 360 9701, 369270, 369271, H02K 122, H02K 2112
Patent
active
057961930
ABSTRACT:
A rotor is formed by a rotary frame 3 composed of a nonmagnetic material, a field magnet 5, a yoke 4 and an auxiliary yoke 7. A disk 12 is mounted on the rotary frame 3. An opening 4b is formed in the yoke 4 to thereby cause attractive magnetic flux from the field magnet 5 to effectively act on a clamping yoke 13 of the disk, so that the disk 12 can be firmly clamped. The yoke 4 covers the circumferential part of the field magnet 5 on its disk 12 side to thereby cut off magnetic flux leakage toward the disk 12, so that its adverse effect on the recording surface of the disk 12 can be avoided. The auxiliary yoke 7 so arranged that a stator coil 6 is interposed between the auxiliary yoke 7 and the field magnet 5 is secured to the rotary frame 3 to thereby increase effective rotating magnetic flux so that output torque is increased.
REFERENCES:
patent: 3845339 (1974-10-01), Merkle et al.
patent: 4401419 (1983-08-01), Rabe
patent: 4874976 (1989-10-01), Ohsawa et al.
patent: 4987333 (1991-01-01), Noguchi et al.
patent: 5128818 (1992-07-01), Koizumi et al.
patent: 5153470 (1992-10-01), Miyaji et al.
patent: 5254895 (1993-10-01), Koizumi
patent: 5453650 (1995-09-01), Hashimoto et al.
Saito Shouichi
Sakano Hiromichi
Dougherty Thomas M.
Olympus Optical Co,. Ltd.
Tamai Karl
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